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The less time the better discharged but 12 hours is not too bad. More important is whether it's deep cycle. A starting battery will not tolerate that kind of cycling for very long.
You would want something like a yellow top if you like the AGM. Or a deep cycle flooded. Don't bother with dual purpose starting / deep cycle, a deep cycle should start just about anything.
If money is not an issue then a battery warmer would help too. You get much better output and amp hours from a warm battery. And if you are running all those pads then you will need the capacity.
The only caveat I would give you is that charging a deep cycle with your alternator would hurt your FE a bit. An ideal system would be a regular starting battery and a deep cycle you charge at home for all your heaters.
I was looking at those 12v pads too. Good for people who can't plug in.
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Vortex generators are old tech. My new and improved vortex alternators are unstoppable.
"It’s easy to explain how rockets work but explaining the aerodynamics of a wing takes a rocket scientist.
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